Performance of bismuth germanate active shielding on a balloon flight over Antarctica

Details Performance of bismuth germanate active shielding on a balloon flight over Antarctica Performance of bismuth germanate active shielding on a balloon flight over Antarctica

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990itns...37..559r&link_type=abstract

(IEEE, 1989 Nuclear Science Symposium, San Francisco, CA, Jan. 17-19, 1990) IEEE Transactions on Nuclear Science (ISSN 0018-9499

Computer Science

Performance

9

Antarctic Regions, Balloon Flight, Bismuth Compounds, Earth Orbital Environments, Germanates, Radiation Shielding, Charged Particles, Gamma Ray Spectra, Performance Tests, Supernova 1987A

Scientific paper

The GRAD (Gamma-Ray Advanced Detector) gamma-ray spectrometer was flown on a balloon at an altitude of 36.6 km over Antarctica on January 8-10, 1988, where it was used to make observations of SN 1987A. The performance of the bismuth germanate (BGO) active shielding in the near-space environment over Antarctica is examined. The promised effectiveness of this shielding in the suppression of unwanted background has been demonstrated. The BGO-shielded GRAD spectrometer detected gamma-ray lines with fluxes of 0.002/sq cm sec from SN 1987A in a radiation background approximately a factor of 4 more intense than that over Alice Springs, Australia. This level of sensitivity indicates that BGO is at least as effective as CsI when used as active shielding. Isomerism is common, both in the bismuth and germanium regions of the nuclear chart, but is found to be less of a problem for background suppression in the latter region than in the former.

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